Representation = the people's rule through the chosen (the democratic size-problem's answer: the millions cannot assemble; the representatives can). The theory's models (by name): (1) the trustee model (Burke — the representative's own judgment for the constituents' good, not their instructions); (2) the delegate model (the representative as the voters' mouthpiece); (3) the mandate model (the party's manifesto as the authorisation); (4) the responsible-party model (the coherent parties, the accountable governments); (5) the descriptive vs. substantive pair (the representation as presence — the assembly mirroring the society's genders, castes, regions — vs. the representation as action — the interests' advocacy; the quotas' and PR-lists' theory).
The forms: the territorial representation (the constituency's member), the functional (the occupational-and-group faces — history's curia), the party-list representation (the PR's vehicle), and the reserved-and-quota forms (the inclusion engineering — Nepal's constitutional design's own signature).